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我有一个独特的双精度对应于三个字符串的变化。我想填充字典或其他东西,以便我可以调用类似dict[key1][key2][key3]的东西并获取值。

我已经尝试了很多东西,比如

    Dictionary<string, Dictionary<string, double>> dict = new Dictionary<string, Dictionary<string, double>> {
        { "Foo", {"Bar", 1.2 } },
        { "Foo", {"Test", 3.4 } }
    };

这给了我语法错误和错误,例如“错误 4 命名空间不能直接包含字段或方法等成员”

    Dictionary<double, Tuple<string, string>> dict = {
          {1.23, "Blah", "Foo"}
    };

这给了我类似“错误 1 ​​只能使用数组初始化表达式来分配给数组类型。尝试使用新表达式”之类的错误。

    object dict = new Dictionary<string, Dictionary<string, Dictionary<string, string>>>();

    dict["k1"] = new Dictionary<string, Dictionary<string, string>>();
    dict["k1"]["k2"] = new Dictionary<string, string>();
    dict["k1"]["k2"]["k3"] = 3.5;

这给了我语法错误和错误,例如“类、结构或接口成员声明中的错误 2 无效标记“k1””

我该怎么办?提前致谢。

![在此处输入图像描述][1]

在此处输入图像描述

编辑:尝试琼斯的代码:

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        string[] grades = { "Grade 1", "Grade 5", "Grade 8", "ASTM A325", "316 Stainless", "Monel", "Brighton Best 1960" };
        string[] sizes = { "#1", "2", "3", "4", "5", "6", "8", "10", "12", "1/4", "5/16", "3/8", "7/16", "1/2", "9/16", "5/8", "3/4", "7/8", "1", "1-1/8", "1-1/4", "1-3/8", "1-1/2" };

        var dict = new Dictionary<string, Dictionary<string, Dictionary<string, double>>>();
        dict["k1"] = new Dictionary<string, Dictionary<string, double>>();
        dict["k1"]["k2"] = new Dictionary<string, double>();
        dict["k1"]["k2"]["k3"] = 3.5;


        public Form1()
        {
            InitializeComponent();
        } 
4

2 回答 2

4

你的最后一次尝试很接近,你想要:

var dict = new Dictionary<string, Dictionary<string, Dictionary<string, double>>>();
dict["k1"] = new Dictionary<string, Dictionary<string, double>>();
dict["k1"]["k2"] = new Dictionary<string, double>();
dict["k1"]["k2"]["k3"] = 3.5;

你想要var而不是object

(或者Dictionary<string, Dictionary<string, Dictionary<string, double>>>如果你喜欢滚动)

你的最后一个字符串应该是一个double.

于 2015-01-06T19:22:05.387 回答
0

据我了解,您有数据并希望在其中执行查找。为什么你不能为此目的使用一些数据库?

但如果你真的想硬编码所有值,你可以。只是不要手动初始化字典,进行简化 - 在运行时解析数据。

像这样的东西。(我想,您是 c# 编程的新手,所以我创建了新的控制台应用程序并复制粘贴了所有代码以方便您使用)

public class Program
{
    // harcode all data as string
    const string RawData =
        "k11,k12,k13=3.4;" +
        "k21,k22,k23=4.42;" +
        "k31,k32,k33=5.91;" +
        "k41,k42,k43=8.14;" +
        "k51,k52,k53=4.13;" +
        "k61,k62,k63=5.4";

    static void Main(string[] args)
    {
        // create dictionary from hardcoded string
        var data = ParseData();

        // use Tuple as key for data lookup
        var value = data[Tuple.Create("k11", "k12", "k13")];

        // check, that value equals expected one
        Debug.Assert(value == 3.4);
    }

    private static IDictionary<Tuple<string, string, string>, double> ParseData()
    {
        var parsedData =
            RawData
                .Split(';')
                .Select(ParseRow)
                .ToDictionary(x => x.Item1, x => x.Item2);

        return parsedData;
    }

    private static Tuple<Tuple<string, string, string>, double> ParseRow(string row)
    {
        var parts = row.Split('=');
        var coefficients = ParseCoefficients(parts[0]);
        var value = Double.Parse(parts[1], CultureInfo.InvariantCulture);

        return Tuple.Create(coefficients, value);
    }

    private static Tuple<string, string, string> ParseCoefficients(string row)
    {
        var coeffs = row.Split(',');
        var result = Tuple.Create(coeffs[0], coeffs[1], coeffs[2]);

        return result;
    }
}

作为另一个简化,您可以使用自定义类作为字典键而不是嵌套字典。编写你自己的(注意,它应该覆盖平等成员EqualsGetHashCode),或者使用基类库中的东西。Tuple<string, string, string>是完美的。

于 2015-01-06T20:54:52.213 回答